THE PREVENTION OF INFECTIOUS DISEASE. 413 



tion. The warfare against social misery means 

 also protection to trie well-to-do upon a side 

 on which they are themselves powerless. It 

 is undoubtedly possible, by the bettering of 

 our ways of life and by the hygienic education 

 of the community, to diminish greatly the sum 

 of predisposition to disease and to heighten 

 the immunity of the whole people. Personal 

 and public measures of sanitation, thus under- 

 stood and administered, constitute also a form 

 of racial hygiene deliberately conscious of the 

 end to be secured. The actual solidarity of 

 the interests of all classes of people and a 

 knowledge of the practical limits of egotism 

 will gradually bring to maturity more practi- 

 cal social hygiene than any appeal to our 

 sentiments of humanity. 



Among individual measures of this charac- 

 ter cleanliness may claim an altogether special 

 place, that cleanliness which the Englishman 

 says is health itself, and which I have declared 

 to be the first and better half of disinfection. 

 But in this respect, also, education must lay the 

 foundation. It must be a thing taught in the 

 common schools, in the factories and the work- 

 shops ; in the army it has already achieved 

 great success. I think that Else Hueppe 

 grasped the kernel of the matter when with 

 reference to the terrible social misery which 



